TPS40050: TPS4005 abnormal issue

Part Number:TPS40050

Describe :  RKFF = 62K & RA = 430K that SMPS can normal work (Turn on point at 10V when ambient = 25 deg C)

issue :  The turn on point (UVLO) will change to 9.8V when ambient = -40 deg C

      Calculate the RKFF (55K ohm) and RA (443K ohm) for adjust the lower UVLO point (9.2V) , but it don’t helpful

      Could you please help reply it or tell us how to adjust it ?

      Thanks a lot.